and, in fact, i often go back to a great old quote by henry ford who said, "those who think they can and those who think they can't are both right." this is within our power. we have waited, however, a long time to really engage this issue and to get started. and unfortunately, and this is actually a core american value, it goes back to the founding of this country and it goes back to benjamin franklin, one of the leading lights of that time, who said, and every american knows this, "an ounce of prevention is worth a pound of cure." a little action now is going to forestall much greater -- the need for much greater action later. and that's exactly the nature of this problem, is that if we delay -- if we wait until we've reached three and four degrees, it's too late. at that point the climate system is locked. it's a massive system. the heat is already in earth's system, it's absorbed in the oceans, it's being absorbed by the ice systems. it's in the atmosphere, there is no magic vacuum cleaner that's going to suddenly pull the co2 out and bring our temperatures back to what we consid